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<section id="mep29-text-light-markup">
<h1>MEP29: Text light markup<a class="headerlink" href="#mep29-text-light-markup" title="Link to this heading">#</a></h1>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#status" id="id1">Status</a></p></li>
<li><p><a class="reference internal" href="#branches-and-pull-requests" id="id2">Branches and Pull requests</a></p></li>
<li><p><a class="reference internal" href="#abstract" id="id3">Abstract</a></p></li>
<li><p><a class="reference internal" href="#detailed-description" id="id4">Detailed description</a></p></li>
<li><p><a class="reference internal" href="#implementation" id="id5">Implementation</a></p>
<ul>
<li><p><a class="reference internal" href="#improvements" id="id6">Improvements</a></p></li>
<li><p><a class="reference internal" href="#problems" id="id7">Problems</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#backward-compatibility" id="id8">Backward compatibility</a></p></li>
<li><p><a class="reference internal" href="#alternatives" id="id9">Alternatives</a></p></li>
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<section id="status">
<h2><a class="toc-backref" href="#id1" role="doc-backlink">Status</a><a class="headerlink" href="#status" title="Link to this heading">#</a></h2>
<p>Discussion</p>
</section>
<section id="branches-and-pull-requests">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">Branches and Pull requests</a><a class="headerlink" href="#branches-and-pull-requests" title="Link to this heading">#</a></h2>
<p>None at the moment, proof of concept only.</p>
</section>
<section id="abstract">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Abstract</a><a class="headerlink" href="#abstract" title="Link to this heading">#</a></h2>
<p>This MEP proposes to add lightweight markup to the text artist.</p>
</section>
<section id="detailed-description">
<h2><a class="toc-backref" href="#id4" role="doc-backlink">Detailed description</a><a class="headerlink" href="#detailed-description" title="Link to this heading">#</a></h2>
<p>Using different size/color/family in a text annotation is difficult because the
<a class="reference internal" href="../../api/_as_gen/matplotlib.axes.Axes.text.html#matplotlib.axes.Axes.text" title="matplotlib.axes.Axes.text"><code class="xref py py-obj docutils literal notranslate"><span class="pre">text</span></code></a> method accepts argument for size/color/family/weight/etc. that are used
for the whole text. But, if one wants, for example, to have different colors,
one has to look at the gallery where one such example is provided:
<a class="reference internal" href="../../gallery/text_labels_and_annotations/rainbow_text.html"><span class="doc">Concatenate text objects with different properties</span></a></p>
<p>This example takes a list of strings as well as a list of colors which makes it
cumbersome to use. An alternative would be to use a restricted set of <a class="reference external" href="https://docs.gtk.org/Pango/pango_markup.html#pango-markup">pango</a>-like markup and to interpret this markup.</p>
<p>Some markup examples:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>Hello <b>world!</b>`
Hello <span color="blue">world!</span>
</pre></div>
</div>
</section>
<section id="implementation">
<h2><a class="toc-backref" href="#id5" role="doc-backlink">Implementation</a><a class="headerlink" href="#implementation" title="Link to this heading">#</a></h2>
<p>A proof of concept is provided in <a class="reference external" href="https://github.com/rougier/matplotlib/blob/markup/examples/text_labels_and_annotations/markup.py">markup_example.py</a> but it currently only handles the horizontal direction.</p>
<section id="improvements">
<h3><a class="toc-backref" href="#id6" role="doc-backlink">Improvements</a><a class="headerlink" href="#improvements" title="Link to this heading">#</a></h3>
<ul class="simple">
<li><p>This proof of concept uses regex to parse the text but it may be better
to use the html.parser from the standard library.</p></li>
<li><p>Computation of text fragment positions could benefit from the OffsetFrom
class. See for example item 5 in <a class="reference external" href="https://matplotlib.org/devdocs/users/explain/text/annotations.html#using-complex-coordinates-with-annotations">Using Complex Coordinates with Annotations</a></p></li>
</ul>
</section>
<section id="problems">
<h3><a class="toc-backref" href="#id7" role="doc-backlink">Problems</a><a class="headerlink" href="#problems" title="Link to this heading">#</a></h3>
<ul>
<li><p>One serious problem is how to deal with text having both LaTeX and
HTML-like tags. For example, consider the following:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$<b>Bold$</b>
</pre></div>
</div>
<p>Recommendation would be to have mutual exclusion.</p>
</li>
</ul>
</section>
</section>
<section id="backward-compatibility">
<h2><a class="toc-backref" href="#id8" role="doc-backlink">Backward compatibility</a><a class="headerlink" href="#backward-compatibility" title="Link to this heading">#</a></h2>
<p>None at the moment since it is only a proof of concept</p>
</section>
<section id="alternatives">
<h2><a class="toc-backref" href="#id9" role="doc-backlink">Alternatives</a><a class="headerlink" href="#alternatives" title="Link to this heading">#</a></h2>
<p>As proposed by @anntzer, this could be also implemented as improvements to
mathtext. For example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="sa">r</span><span class="s2">"$\text{Hello \textbf</span><span class="si">{world}</span><span class="s2">}$"</span>
<span class="sa">r</span><span class="s2">"$\text{Hello \textcolor</span><span class="si">{blue}{world}</span><span class="s2">}$"</span>
<span class="sa">r</span><span class="s2">"$\text{Hello \textsf{\small world}}$"</span>
</pre></div>
</div>
</section>
</section>
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